The Unmanned K-MAX helicopter being developed by Kaman Corporation and Lockheed Martin has further demonstrated the potential of this type of aircraft in the field by completing a list of airdrop firsts. The milestones in payload weight and altitude were reached during a recent series of tests at the Army's Yuma Proving Ground in Arizona where the KMAX (UAS) made guided airdrops via sling load at an altitude of 10,000 ft above sea level including a payload of 4,400 lbs.